TITLE: GCN CIRCULAR NUMBER: 17115 SUBJECT: GRB 141121A: RATIR Optical Observations - Errata for GCN 17105 DATE: 14/11/29 04:27:02 GMT FROM: Alan M. Watson at Instituto de Astronomia UNAM Alan M. Watson (UNAM), Nat Butler (ASU), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (ORAU/GSFC), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), José A. de Diego (UNAM), Leonid Georgiev (UNAM), Jesús González (UNAM), Carlos Román-Zúńiga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report: We wish to correct an error in our earlier report of a faint source close to GRB 141121A (Watson et al., GCN 17105). The faint source is to the WEST of the afterglow, not to the EAST as we reported. With this correction, our earlier report and that of Mazaeva et al. (GCN 17111) are now in agreement. Our preliminary astrometry, based on SDSS DR9, for the afterglow is: 08:10:40.61 +22:13:01.7 J2000 and for the fainter source: 08:10:40.41 +22:13:01.8 J2000 This astrometry may be refined as the afterglow fades and fainter source becomes more clearly separated. We thank Mazaeva et al. (GCN 17111) for bringing this error to our attention.